Smooth back-to-top button

function backToTop() { var scrollPos = 0; var element = $('#back-to-top'); $(window).scroll(function() { var scrollCur = $(window).scrollTop(); if(scrollCur > scrollPos){ // scroll down if(scrollCur > 500){ element.addClass('active'); } else { element.removeClass('active'); } } else { // scroll up element.removeClass('active'); } scrollPos = scrollCur; }); element.on('click',function(){ $('html, body').animate({scrollTop: '0px'}, 800); }) }
Make back-to-top button smooth. Button was show when scroll down.

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